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In page Pierre Schaeffer:

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Furthermore, he emphasized the importance of "playing" (in his terms, jeu) in the creation of music. Schaeffer's idea of jeu comes from the French verb jouer, which carries the same double meaning as the English verb play: 'to enjoy oneself by interacting with one's surroundings', as well as 'to operate a musical instrument'. This notion is at the core of the concept of musique concrète, and reflects on freely improvised sound, or perhaps more specifically electroacoustic improvisation, from the standpoint of Schaeffer's work and research.